Onto World has been renamed as Semantic Web Dot Org www.semanticweb.org 
April 2008
Onto World (ontoworld.org ) is an example of a Semantic Media Wiki which at the same time provides a location for the discussion of the ideas. See for example Onto Clean.
An error occurred while loading http://ontoworld.org/wiki/Main_Page: Unknown host ontoworld.org
Unfortunately the Onto World site is working only intermittently at the moment. I have reported it to the maintainer who says the problem is with the DNS and the site is there. Contact went down recently when I was actually using it. I will amend this entry when it becomes reliable again as I am committed to using it. -- John Fletcher 25th February 2008
I am back onto Onto World today. I have not heard whether the problem has been completely fixed. -- John Fletcher 26th February 2008
Since the entry I have not had problems linking to Onto World. -- John Fletcher 5th April 2008
Onto World has been renamed as Semantic Web Dot Org www.semanticweb.org
See original on c2.com